Electrochemical-enhanced MoS2/Fe3O4 peroxymonosulfate (E/ MoS2/Fe3O4/PMS) for degradation of sulfamerazine. (November 2022)

• Record Type: Journal Article
• Authors: Zhao, Quan-ming; Jiang, Haotian; Wang, Zhenjun
• Is Part Of: Chemosphere. Volume 307:Part 4(2022)
• Publication Date: 2022-11
• Subjects: PMS -- Oxidative degradation -- Fe3O4 -- MoS2 -- Electrochemical; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.136198
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Seeking effective methods to degrade organic pollutants has always been a hot research field. In this work, MoS2 /Fe3 O4 catalyst was synthesized by hydrothermal method with MoS2 as carrier to construct an advanced oxidation system of electrochemical enhanced MoS2 /Fe3 O4 -activated peroxymonosulfate (E/MoS2 /Fe3 O4 /PMS). The materials were characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. The degradation efficiency of sulfamerazine (SM1) by E/MoS2 /Fe3 O4 /PMS system was investigated and reaction mechanism was explored. The results showed that the removal rates of SM1 within 30 min were 31%, 20% and 89% with Fe3 O4, MoS2 and MoS2 /Fe3 O4 as catalysts, respectively. The characterization results revealed that Fe(III) on the surface of Fe3 O4 was reduced to Fe(II) and Mo(IV) was oxidized to Mo(VI) in the presence of MoS2 . The synergistic effect between Fe3 O4 and MoS2 enhanced the PMS decomposition and improved the SM1 removal efficiency. Free radical quenching experiments showed that SO 4 − ⋅, ·OH, O2 · and 1 O2 were all involved in the degradation of SM1, and the effect of 1 O2 was more significant than other active substances. Low concentrations of Cl − and humic acid (HA) had no significant inhibitory effect on the degradation of SM1, while HCO 3 − had a significant inhibitory effect on the E/MoS2 /Fe3 O4 /PMS system. In addition, catalyst cycling experiments showed that MoS2 /Fe3 O4 maintained good stability before and after the catalytic reaction process. Graphical abstract: Image 1 Highlights: MoS2 /Fe3 O4 catalyst was synthesized by hydrothermal method. SO 4 −, ·OH, O2 · and 1 O2 were all involved in the degradation of SM1. Cl − and humic acid (HA) have no significant inhibitory effect on SM1 degradation.